PREVENTION, KICK-BACK.--A choke coil placed in the power circuit to prevent the high frequency currents from getting into the transformer and breaking down the insulation.
Q S T.--An abbreviation used in wireless communication for (1) the question "Have you received the general call?" and (2) the notice, "General call to all stations."
QUENCHED GAP.--See Gap, Quenched.
RADIATION.--The emission, or throwing off, of electric waves by an aerial wire system.
RADIO AMMETER.--See Ammeter, Hot Wire.
RADIO FREQUENCY.--See Frequency, Radio.
RADIO FREQUENCY AMPLIFICATION.--See Amplification, Radio Frequency.
RADIO FREQUENCY CURRENT.--See Current, Radio Frequency.
RADIO INSPECTOR.--See Inspector, Radio.
RADIOTRON.--The trade name of vacuum tube detectors, amplifiers, oscillators and modulators made by the Radio Corporation of America.